21=4x+20

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Solution for 21=4x+20 equation: 



21=4x+20

We move all terms to the left:

21-(4x+20)=0

We get rid of parentheses

-4x-20+21=0

We add all the numbers together, and all the variables

-4x+1=0

We move all terms containing x to the left, all other terms to the right

-4x=-1

x=-1/-4

x=1/4

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